In the infirmary of the teaching building, Yan Yin slept quietly on the white hospital bed inside, with a bandage on his chest, and he was just a wounded man at this time.

"Waning Moon! Wake me up. "There are clothes stacked next to the bed, and on top is the moon slash, and the headset next to it is coming out with a slight sound.

Yan Yin opened his eyes, reached out and picked up the headset, and put it on his head.

"Who?"

"Waning Moon, it's time for a mission."

"Darkflower? How did you hack into our channel. Yan Yin was a little surprised.

"Why did you hack into you? I'll just pull you in. ”

"Oh, so how do you know that, I'm going to be in the school infirmary." Yan Yin didn't seem surprised, if at this time, the Darkflower Blade didn't contact him would be the most surprised.

"Do you know the 'Three Circles of Battle'?"

"You know, the first front is the 'war' of the soldiers of the city wall, the second front is the 'intelligence' of the machine front, and the third is the 'guard' of the mass front in the inner circle, which is usually no different, and once opened, 'intelligence' and 'protection' can only be connected by special channels."

"Since, then you will definitely return to the second front if you are injured, and the third front will never lift the blockade unless the first front is breached, so you can only be on the second front, and the second front only has a repair station except for the medical treatment of the soldiers on the first front, and the only developed medical center is the school infirmary."

"Why isn't there a professional medical clinic for our students?" The words are a little strange.

"By the way, were you beaten stupid?" There was a somewhat helpless tone on the other end of the headset.

"So where are the injuries of students in the school usually treated?"

"Infirmary." Yan Yin did not hesitate and replied quickly

"So how many students are there in this battle?"

"Five."

"So how many years does this fight come in?"

"Needless to say, I know." Yan Yin suddenly understood the arrangement and thoughts of the Darkflower Blade. Suddenly he asked, "How do you know I'll be back early." ”

"I'm listening, and your plan was a bit problematic in the first place, if you come back on your own, not only will you be suspicious afterwards, but the success rate is also pitifully low, but this time they sent you back by themselves, isn't it?"

"How many people are there in the school? How long will it take for the biobarrier to be re-established? Yan Yin asked as he put on his clothes.

"I'm in the black building console, if you don't count the two corpses next to you, there is still one person in the whole school, and there are at least 3 hours left in the biological barrier, and you only have half an hour of rest." Darkflower Blade sat in front of the console of the black building, the dense screen in front of her monitored all the corners of the black building, she tilted her head to look at the staff members on the chairs on the left and right who had their throats cut, and then replied.

Yan Yin was dressed neatly, put the moon chop behind his waist, touched his chest and continued to ask.

"Who else?"

"Mr. Na, Naryn. What he was working on in the largest bio laboratory in the black building, it seemed that it wouldn't come out at least until the biobarrier was replaced. ”

"Okay, I'll be right here."

Yan Yin stood at the door of the infirmary, opened the door, he exhaled softly, his pupil color quickly changed, turning into golden pupils, he took a step forward, but before his feet landed, he turned into black smoke and disappeared.

Twenty seconds later, a black smoke appeared out of thin air in front of the black building, and then the word seal reappeared.

"Tsk, 'Darken' is one of your dual abilities. By the way, don't swipe your card, just come in. "Darkflower Blade was amazed in front of the control room.

"You don't need to know this, and you don't need to know." Yan Yin said coldly, walking into the black building.

Yan Yin's eyes darkened, and then he appeared inside the black building.

"How can I get in without a card?" Yan Yin looked at the black passage in front of him and asked, he knew the consequences of rushing in without recording.

"I've already done it for you, I 'get' a card that can go directly to the deepest part, next to the card is a structural diagram of a black building, I suggest you go to the door of that place and look at it." Darkflower Blade said lightly, as if he was drinking something in his mouth.

Yan Yin walked over, a card stamped on a recorder like a pen, he didn't know whose card it was, but he didn't want to care, he picked up the structure diagram and ran into the depths.

"Follow my instructions, left, right, right......"

I don't know if it's an illusion, but the deeper he goes, the more he feels something in the depths that attracts him, and if he guesses correctly, then that's his goal.

He walked for nearly 20 minutes, and then he came to a black gate, the gate was nearly 5 meters high, carved with reliefs, the door on the left was a creature like a leopard, in the middle of the storm, hunched and ready to jump out at any time, trying to tear the target apart, but the door on the right was a giant lizard creature, covered with electric arcs, two pairs of wings behind it were open, the two were opposite, and the battle was about to break out.

"Does it feel lifelike? It's even perfect. Darkflower Blade sighed.

"Hmm. Is it the story of those two S-class monsters? Yan Yin couldn't help but take a step back, as if the sacred battle between these two 'gods' would not allow him to be violated by an outsider.

"Yes, I can only help you open the door, I can't help you directly how to go behind, you can only see yourself, but if I can help, I will definitely help you." At this moment, her tone was so serious.

The door slowly opened, and inside was a passageway, surrounded by a floor covered with glass, and it seemed that something could be seen through the glass.

Yan Yin took out the black architectural structure diagram, and he was completely shocked when he looked at it closely.

According to the picture, he was a few floors away from the top floor at this time, but he knew that he only turned left and right, and did not go up and down the stairs at all, so how did he come up? He went on.

"Crazy! It must be a madman to create this. Yan Yin exclaimed, his face full of incredulity.

The mechanism of the whole floor is spiraling, and the attraction of the special substance on the top floor cancels out the gravity, so that a gravitational source is created obliquely, so that the direction of the new gravity is perpendicular to the floor, which makes people feel like they are on the flat ground, so Yanyin has a new question, what is the source of the new gravity, how can the energy source continue to produce such a large attraction, and he does not feel it when he is outside?

In this way, why he felt dizzy and uncomfortable when he entered the Black Tower building, and why the size of a training ground was wider than the Black Tower building itself completely made sense.

But he quickly resisted the idea of digging deeper.

At this moment, it is the time of the mission.

He walked into the door, the door slowly closed again, he only saw through the glass the endless darkness, in fact, the glass passage was also so dark, there was not even a light source, he continued to walk, and gradually bright spots appeared around, as if he was in the night sky, and there were more and more points of light, as if to form a galaxy, Yan Yin was deeply intoxicated by it.

"Waning Moon!" A call came from the headset.

The words struck a spirit, and the surroundings were dark again, as if the point of light had never appeared, and it may not have appeared in the first place.

Black, deadly black, fear-filled black.

Fear, endless fear, fear full of darkness.

He likes pure darkness, but he doesn't like this inexplicable blackness